Oil-well pump



1.1. LARKIN AND R. L. GORDON.

0|L WELL PUMP.

APPLICATION FILED SEPT. 1, 1921.

Patented July 25, 1922;

[nvezo/ John, J' Larkin. Raben? L- GUTCOL- Ubllllbl STATES PATENT QFFIQ.

JOHN' a. LABKINQOF sr. LOUIs, MISSOURI.' AND ROBERT L. GORDON, OPDARrLEs- VILLE, OKLAHOMA., AssIGNORs To BELL PUMP COMPANY, orBARTLESVILLE, OKLAHOMA, A PARCJNNRsIIIP OOMPOsED OP JOHN J. LARKIN,ROBERT L. GOP.- DON, AND A. W. sIIULrPIIs, or INDEPENDENCE, KANSAS.

OIL-WELL PUMP.

inaaeco.

Application filed September 1, 1.921.

T0 all whom it may concern.:

Be it known that we, JOHN J. LARKIN and ROBDRT L. GORDON, citizens ofthe United Y States, residing at St. Louis, Missouri, and

i s cription, such as will enable others skilled in the art to `which itappertains tomake and use the same, reference being had to theaccompanying drawings, forming part of this application.

Our invention relates to oil well pumps and consists in improvements inthe type of pump disclosed in Bell Patent No. 991,600. The pump thereshown has been manuactured in large quantities and has gone intoextensive use, but the parts have been designed for a given stroke, andincreasing the stroke destroys the effectiveness oit the pump although agreater stroke is Otten desirable. One object of our invention is toprovide `a working barrel for such a pump. which, whether comprisingoriginal or reiitting equipment, will permit the use of any i requisitestroke.

We have also found that the settling of sand about the pump workingbarrel impairs its operation, and another object of our invention is toeliminate the accumulation of sand around the pump.

Additional objects and advantages of our invention will appear in thefollowing description and in the accompanying drawings forming part ofthis specification, in which- ?Figure 1 is a vertical section throughthe lower end of a well equipped with our improved pump;

Figure 2 is a detail ot the working barrel drawn on an enlarged scale,and, f

Figure 8 is an enlarged view of the lower end of one of the pump tubes.

Figure 4 shows a modified form of the working barrel.

rThe outer wall 1 of the pump is oined to the well tubing 2 and forms anextension of the same. A bottom casting 3 closes the lower end of thepump except for the entry ports for the oil.

Mounted in the bottom casting 3 is a pump working barrel 4 consisting ofa length of tubing which is crimped at a substantial dis- Specication ofLetters Patent.

usual plunger 8 and check valve 9.

Patented July 25, 12252;.

Serial No. 497,570.

tance above its lower end to provide a seat 5 forthe pump standing valve6.

A hollow pump piston 7 is slidable within working barrel 4 and isequipped with the The upper end of piston 7 is secured to a clutchhousing member 10, and depending from member 10 and surrounding workingbarrel 4 is a short downtake tube 11. Depending` from member 10 andsurrounding tube 11 is a downtake tube 12 which extends substantiallybelow the lower end of tube 1l.

As explained in the above mentioned patent, the space between theworking barrel 4 and tube 11 forms a chamber for the reception of gasthe pressure of which prevents the passage of oil containing sand, etc.,to the plunger cups and valve.

The lower end of tube 12 is deeply recessed or notched to provide teeth13 which are adapted to be thrust into the sand, etc., settling to thebottom of the pump and to continually agitate same so that it may bedischarged with the oil from the well. The lower ends of teeth 13 arepreferably beveled for more eEective work on the pump de posits.

The commercial pump manufactured under the above mentioned patent, wasdesigned for a 20 stroke and was only effective when the stroke did notexceed that distance. This is because when the stroke exceeded 20, thebottom of tube 11, on the upstroke, rose so close to the top edge ofworking barrel `4 that the gas chamber normally formed by thetelescoping of the tube 11 with the working barrel no longer existed andconsequently thefiuid surrounding barrel 4 was permitted to rise on theinside O the tube 11 and flow over the top of the working barrelcarrying the destructive sand with it.

In practice, it was found that in certain circumstances it was necessaryto have a pump which could be operated with a stroke exceeding 20, andto adapt the manufactured pump for this purpose, it became necessaryto'increase the length of the tubes 11 and 12 and to correspondinglyincrease the height of the working barrel 4 and to increase the lengthof the outer shell l.

Because of the gas which tends to accumulate between .the standing valve6 and plunger S.,

cult and expensive we prefer to provide a seat Jfor the standing valvespaced Yfrom the bottom of the pump.r

This was previously accomplished by threading the-lower interior ofworking barrel 4 and securing an extension therein which raised theworking` barrel the necessary distance and the lower end of which wasscrewed into the bottom casting 3'. This necessitated the cutting oi'threads on the interior of the lower end of the working barrel and atboth ends of the extension, which threads had to be very raccurate inorder to preserve the alinement of working barrel 4 and outer shell l.lt necessitated a new bottom casting adapted toy tit the smallerdiameter oi' the extension and consequently the stocking of two sizes ofbottom castings by both the manufacturer and the operator.

lVith our improvement, the *onlyl additional operation on the workingbarrel is that ot forming the seat 5 for the standing,` valve, anoperation which is easily and quickly completed with the proper tool andinwhich extreme accuracy is not essential.

lf preferred the standing valve seat may be provided as shown in Figure4 by inserting a pipe 14 of smaller diameter in barrel 4 and securingthe two together so that the upper end 15v ot pipe 14 i-s located at thesame height as the crimp in pipe 4 in Figure l.

le are aware that other modifications of our invention may be madewithout departing1 from the spirit thereof, as indicated by thefollowing claims:

l. ln an oil wel-l' pump, a casing, a bottom casting` therefor, aworking barrel seated in said bottom casting, a standing valve seated insaidA working; barrel ata substantial distance above said bottomcasting, a reciprocatory plunger in said working barrel.7 and adischarge chamber surrounding said barrel`r the wall' ot which chamberreciprocates with said plunger, and the lower end of said wall, at thebottom of its stroke,v eX- tends below said standing valve but is spacedsubstantially 'from said casting.

2. ln an oil well, a pump device comprising` a working` barrel' adaptedto cooperate with the pump casing to form a pocket and provided with astanding valve seat at a.

substantial distance above-Lthe bottoni of the pocl et a dischargechamber wall surrounding said barrel and extendinginto said pocket andprovidedl with a toothed lower end which` extends below said standingvalve upon the down stroke ot' the pump.

Iny testimony whereof we hereunto atliX our signatures this 27th dayofAugust, 1921.

JOHN J. LAB-KIN. ROBERT L. GORDON.

